Waking up at the end of the WORLD, as a kid?

Luke is annoyed. Why did he have to be stuck like this? He's some 8 or 9 years old now and being forced to stick around annoying people who will end up dead like everyone else.

or

Luke wakes up as a kid and knows he once was an adult but does not remember anything really about that life. He finds this new kid's life taking over more and more of his mind, and gets stuck as a prisoner for a group of survivors held up in a prison, after 'happily' surviving on his own for the last 6 months.

I'm not the best writer, just doing this for fun,

(Update) now I am done, I do have ideas for a sequel, but I want to do some other things for now, so don't expect it anytime soon.